#第一步：清理impala垃圾数据，同步集群时间
for n in node01 node02 node03
do
	ssh $n "echo 1 > /proc/sys/vm/drop_caches"
	ssh $n "rm -rf /tmp/hsperfdata_impala"
	ssh $n "ntpdate -u 0.uk.pool.ntp.org"
done


